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Chinese Lo-lang one of four colonies (Nangnang, Chinbon, Imdun, and Hyonto) established in 108 BC by Emperor Wu Ti of the Han dynasty (206 BCAD 220) of China when he conquered the ancient Korean state of Wiman (later named Choson). Nangnang, which occupied the northwestern portion of the Korean peninsula and had its capital at P'yongyang, was the only one of the four colonies to achieve success. It lasted until AD 313, when it was conquered by the expanding northern Korean state of Koguryo. Chinbon and Imdun were abandoned in 82 BC and Hyonto in 75 BC. An extremely prosperous state with a population of around 400,000, Nangnang was the centre of Chinese culture and influence in Korea at the time. The Chinese officials assigned to govern Nangnang brought with them all the customs of their motherland and created a miniature Chinese society. The tombs left behind by this Chinese ruling class contain some of the finest examples of ancient Chinese art in existence. Though the Chinese culture and social institutions of Nangnang appear to have had little impact on the general population of Korea at the time, its technology, especially the metalworking techniques, strengthened the native tribal communities outside of Chinese dominance.